Bug report

Bug description:

Description

Equality with self now returns True in 3.13 for dataclasses with deleted attributes. Previously, this would raise an exception.

This may be related to changes discussed in#128294. However, unlike
other reports (#120645,#116647) where something that was True in 3.12 is now False or an Exception,
this issue is the inverse. In 3.13, the equality test silently returns True when previously it would raise.

This class is badly behaved, it should probably still raise an error.

Test Case

importdataclasses@dataclasses.dataclassclassTest:a:intdef__init__(self):self.a=1defdel_a(self):delself.ao1=Test()o2=Test()o1.del_a()o2.del_a()print(o1==o1)# True (3.13), raises AttributeError (3.12)print(o1==o2)# raises AttributeError (3.13, 3.12)# AttributeError: 'Test' object has no attribute 'a'

CPython versions tested on:

3.13, 3.12

Operating systems tested on:

Linux